1) Change the pot now, take the biggest pot you can manage
2) Keep the pot beside any pillar, trellis... i.e very strong support
3) Climbers need to tie-up as they dont twine themselves
4) Potting mix should be 50:50 manure:soil (soil must be fresh)
5) Spray Imidacloprid every 15 days, whether you see pests or not
6) NPK 20:20:20 1 teaspoon in 4 litre water on weekly basis, i.e. 1 litre of this solution alternate day